Sony HCDGNX-88 Service manual
HCD-GNX88
SERVICE MANUAL
Ver.1.0 2005. 02
• HCD-GNX88 is the Amplifier,
CD player, tape deck and tuner
section in MHC-GNX88.
Model Name Using Similar Mechanism NEW
CD CD Mechanism Type CDM74-F1BD84
Section Base Unit Name BU-F1BD84
Optical Pick-up Name KSM-215DCP/C2NP
TAPE Model Name Using Similar Mechanism NEW
Section Tape Transport Mechanism Type CMAT5Z2
E Model
SPECIFICATIONS
The following are measured at AC 127 V, 60 Hz
DIN power output (rated) 180 + 180 watts
(6 ohms at 1 kHz, DIN)
Continuous RMS power output (reference)
225 + 225 watts
(6 ohms at 1 kHz, 10% THD)
Inputs
VIDEO/MD (AUDIO) IN (phono jacks):
voltage 250/450 mV,
impedance 47 kiloohms
TV (AUDIO) IN (phono jack):
voltage 250 mV,
impedance 47 kiloohms
MIC (phone jack): sensitivity 1 mV,
impedance 10 kiloohms
Outputs
VIDEO OUT (phono jack): max. output level 1 Vp-p,
unbalanced, Sync negative,
load impedance 75 ohms
PHONES (stereo mini jack): accepts headphones of 8 ohms or more
FRONT SPEAKER: Use only the supplied speaker
• SS-GNX88
SURROUND SPEAKER: Use only the supplied speaker
• SS-RSX80
SUBWOOFER OUT: Use only the supplied subwoofer
• SS-WGV88
Disc player section
System Compact disc and digital audio system
Laser Semiconductor laser
(λ=780 nm)
Emission duration: continuous
Laser Output Max. 44.6 µW*
*This output is the value measured at a
distance of 200 mm from the objective lens
surface on the Optical Pick-up Block with 7
mm aperture.
Frequency response 2 Hz – 20 kHz (±0.5 dB)
Wave length 780 – 790 nm
Signal-to-noise ratio More than 90 dB
Dynamic range More than 90 dB
OPTICAL CD DIGITAL OUT
(Square optical connector jack, rear panel)
Wave length 660 nm
Output Level –18 dBm
– Continued on next page –
9-879-461-01
2005B02-1
© 2005.02
MiNi Hi-Fi COMPONENT SYSTEM
Sony Corporation
Audio Group
Published by Sony Engineering Corporation
HCD-GNX88
Tape deck section
Recording system 4-track 2-channel stereo
Frequency response 50 – 13,000 Hz (±3 dB), using Sony
TYPE I tape
Tuner section
FM stereo, FM/AM superheterodyne tuner
FM tuner section
Tuning range 87.5 – 108.0 MHz
Antenna FM lead antenna
Antenna terminals 75 ohm unbalanced
Intermediate frequency 10.7 MHz
AM tuner section
Tuning range
Latin American models: 530 – 1,710 kHz
(with the interval set at 10 kHz)
531 – 1,710 kHz
(with the interval set at 9 kHz)
Antenna AM loop antenna
Antenna terminals External antenna terminal
Intermediate frequency 450 kHz
General
Power requirements 127 V AC, 60 Hz
Power consumption 350 watts
Dimensions (w/h/d) (Approx.) 280 x 360 x 398.5 mm
Mass (Approx.) 12.8 kg
Supplied accessories: Remote Commander (1)
Batteries (2)
AM loop antenna (1)
FM lead antenna (1)
Front speaker pads (8)
Surround speaker pads (8)
Subwoofer pads (4)
Video cord (1)
Design and specifications are subject to change without notice.
Notes on chip component replacement
• Never reuse a disconnected chip component.
• Notice that the minus side of a tantalum capacitor may be
damaged by heat.
Flexible Circuit Board Repairing
• Keep the temperature of soldering iron around 270˚C
during repairing.
• Do not touch the soldering iron on the same conductor of the
circuit board (within 3 times).
• Be careful not to apply force on the conductor when soldering
or unsoldering.
CAUTION
Use of controls or adjustments or performance of procedures
other than those specified herein may result in hazardous
radiation exposure.
This appliance is classified as
a CLASS 1 LASER product.
This label is located on the rear
exterior.
Unleaded solder
Boards requiring use of unleaded solder are printed with the lead
free mark (LF) indicating the solder contains no lead.
(Caution: Some printed circuit boards may not come printed with
the lead free mark due to their particular size.)
: LEAD FREE MARK
Unleaded solder has the following characteristics.
• Unleaded solder melts at a temperature about 40°C higher than
ordinary solder.
Ordinary soldering irons can be used but the iron tip has to be
applied to the solder joint for a slightly longer time.
Soldering irons using a temperature regulator should be set to
about 350°C.
Caution: The printed pattern (copper foil) may peel away if
the heated tip is applied for too long, so be careful!
• Strong viscosity
Unleaded solder is more viscous (sticky, less prone to flow)
than ordinary solder so use caution not to let solder bridges
occur such as on IC pins, etc.
• Usable with ordinary solder
It is best to use only unleaded solder but unleaded solder may
also be added to ordinary solder.
SAFETY-RELATED COMPONENT WARNING!!
COMPONENTS IDENTIFIED BY MARK 0 OR DOTTED LINE WITH
MARK 0 ON THE SCHEMATIC DIAGRAMS AND IN THE PARTS
LIST ARE CRITICAL TO SAFE OPERATION. REPLACE THESE
COMPONENTS WITH SONY PARTS WHOSE PART NUMBERS
APPEAR AS SHOWN IN THIS MANUAL OR IN SUPPLEMENTS
PUBLISHED BY SONY.
2
TABLE OF CONTENTS
HCD-GNX88
1. SERVICING NOTES ................................................ 4
2. GENERAL
Location of Controls ........................................................ 5
3. DISASSEMBLY
3-1. Disassembly Flow ........................................................... 7
3-2. Side Panel, Top Case ....................................................... 8
3-3. Loading Panel Assy ......................................................... 8
3-4. Front Panel Assy .............................................................. 9
3-5. Tuner Pack....................................................................... 9
3-6. Tape Mechanism Deck, Mic Board ................................. 10
3-7. Panel Board, CD-SW Board ............................................ 10
3-8. CD Mechanism Deck ...................................................... 11
3-9. CDG Board ...................................................................... 11
3-10. Back Panel ....................................................................... 12
3-11. Primary Board ................................................................. 12
3-12. Power AMP PC Board Assy, Main Board ....................... 13
3-13. Surround Board, PA Board .............................................. 13
3-14. Power Transformer (T1200) ............................................ 14
3-15. Driver Board, SW Board ................................................. 14
3-16. BD84 Board ..................................................................... 15
3-17. Sensor Board ................................................................... 15
3-18. Motor (TB) Board ........................................................... 16
3-19. Motor (LD) Board ........................................................... 16
4. TEST MODE .............................................................. 17
5. MECHANICAL ADJUSTMENTS ....................... 21
6. ELECTRICAL ADJUSTMENTS
Deck section .................................................................... 21
CD Section ...................................................................... 22
7. DIAGRAMS
7-1. Circuit Board Location .................................................... 26
7-2. Block Diagram – CDG Section – ................................... 27
7-3. Block Diagram – Tape Section – .................................... 28
7-4. Block Diagram – Main Section – ................................... 29
7-5. Block Diagram – AMP Section – ................................... 30
7-6. Block Diagram – Display Section – ............................... 31
7-7. Printed Wiring Board – BD84 Board – .......................... 32
7-8. Schematic Diagram – BD84 Board – ............................. 33
7-9. Printed Wiring Board – CD Mechanism Board – ........... 34
7-10. Schematic Diagram – CD Mechanism Board – ............. 35
7-11. Printed Wiring Boards – Main Board – .......................... 36
7-12. Schematic Diagram – Main Board (1/3) – ..................... 37
7-13. Schematic Diagram – Main Board (2/3) – ..................... 38
7-14. Schematic Diagram – Main Board (3/3) – ..................... 39
7-15. Printed Wiring Boards – Panel Board – ......................... 40
7-16. Schematic Diagram – Panel Board – ............................... 41
7-17. Printed Wiring Board – CD-SW, Jog, Mic Boards – ...... 42
7-18. Schematic Diagram – CD-SW, Jog, Mic Board – .......... 43
7-19. Printed Wiring Board – PA Board – ............................... 44
7-20. Schematic Diagram – PA Board – .................................. 45
7-21. Printed Wiring Board – Surround Board – ..................... 46
7-22. Schematic Diagram –Surround Board – ......................... 47
7-23. Printed Wiring Board – CDG Boards – .......................... 48
7-24. Schematic Diagram – CDG Boards – ............................. 49
7-25. Printed Wiring Board – Trans, Primary Boards – .......... 50
7-26. Schematic Diagram – Trans, Primary Boards – ............. 51
7-27. IC Pin Function Description ............................................ 54
8. EXPLODED VIEWS
8-1. Case (Top), Rear Panel Section ....................................... 60
8-2. Front Panel Section ......................................................... 61
8-3. Chassis Section ................................................................ 62
8-4. CD Mechanism Deck Section-1
(CDM74-F1BD84) .......................................................... 63
8-5. CD Mechanism Deck Section-2
(CDM74-F1BD84) .......................................................... 64
9. ELECTRICAL PARTS LIST ................................ 65
3
HCD-GNX88
SECTION 1
SERVICING NOTES
NOTES ON HANDLING THE OPTICAL PICK-UP BLOCK
OR BASE UNIT
The laser diode in the optical pick-up block may suffer electrostatic
break-down because of the potential difference generated by the
charged electrostatic load, etc. on clothing and the human body.
During repair, pay attention to electrostatic break-down and also
use the procedure in the printed matter which is included in the
repair parts.
The flexible board is easily damaged and should be handled with
care.
NOTES ON LASER DIODE EMISSION CHECK
The laser beam on this model is concentrated so as to be focused on
the disc reflective surface by the objective lens in the optical pickup block. Therefore, when checking the laser diode emission, observe
from more than 30 cm away from the objective lens.
LASER DIODE AND FOCUS SEARCH OPERATION CHECK
Carry out the “S curve check” in “CD section adjustment” and check
that the S curve waveform is output several times.
• MODEL IDENTIFICATION
– Back Panel –
PAR T No.
MODEL PART No.
Mexican model 2-547-460-0[]
4
SECTION 2
657
GENERAL
LOCATING THE CONTROLS
List of button locations and reference pages
Main unit
ALPHABETICAL ORDER
A – D
ALBUM +/– ql
AMP MENU ed
AUTO/MANUAL
CD el
CD SYNC qd
Deck A ea
Deck B ws
DIRECTION qk
DISC 1 ~ 3 7
Disc tray 9
DISPLAY rd
Display rf
E – L
ECHO LEVEL wf
ENTER wa
EQ BAND qa
EX-CHANGE/DISC SKIP 6
GR
OOVE
ILLUMINATION rs
IR Receptor r;
eh
3)
2
M – R
MASTER VOLUME 8
MIC 1 (jack) wj
MIC 2 (jack) wh
MIC LEVEL wg
MP3 BOOSTER q;
4)
MPX
qk
OPERATION DIAL wl
PHONES (jack) wk
Power illuminator wd
REC PAUSE/START qh
S – Z
SOUND FLASH e;
SPEAKERS
SUR
SURR SPEAKER MODE
TA P E A/B ej
Ta
TUNER/BAND ek
TUNING +/– qj
TV eg
VIDEO/MD ef
X-ROUND buttons
X-ROUND JOG
X-ROUND OFF
3)
1
1)
ws ea
rg
3)
3
3)
4
3)
1
ROUND
pe lid
WA VE/FADER/BALANCE/
RANDOM/TWISTER
2)
rg
SYMBOLS
?/1 (power) ra
Z OPEN/CLOSE 5
nN (play) qs
. > (go backward/forward)
m M (rewind/fast forward)
X (pause) qf
x (stop) qg
Z A (Eject A) es
B Z (Eject B) w;
Top Panel
1 2 3
This section is extracted
from instruction manual.
1)
For MHC-GNX100/GNX66/
GNX60
2)
For MHC-GNX88/GNX80/
qj
GNX77/GNX70/GX9900
3)
MHC-GNX100 only
ql
4)
For MHC-GNX88/GNX77/
GNX
66
4
HCD-GNX88
Front Panel
rg
rf
rd
rs
ra
r;
el
ek
ej
eh
eg
ef
ed
es
ea
e;
wl
8
9
0
qa
qs
qd
qf
qg
qh
qj
qk
ql
w;
wz
ws
wd
wk wgwhwj
wf
5
HCD-GNX88
Remote control
ALPHABETICAL ORDER
A – E
ALBUM + qf
ALBUM – qh
CD wf
CLEAR qk
CLOCK/TIMER SELECT 2
CL
OCK/TIMER SET
DISC SKIP qd
DISPLAY wh
ENTER qs
EQ qj
F – Z
FM MODE 6
FUNCTION 8
PLAY MODE 5
REPEAT 6
SLEEP 1
4
TA P E wd
TUNER/BAND 7
TUNE
R MEMORY
wg
TUNING MODE 5
VOLUME +/– qg
The + button has
SYMBOLS
a tactile dot.*
?/1 (power) 3
x (s
top)
qa
X (pause) ql
N (play) w;
–. (go backward) ws
>+
(go forward)
wa
m (rewind) q;
M (fast forward) 9
wf
wa
ql
wh
wg
wd
ws
w;
qk
qj
qh
This section is extracted
from instruction manual.
312
4
5
6
7
8
9
q;
qa
qs
qd
qf
qg
*Use the tactile dot as a reference
when operating the system.
6
• This set can be disassembled in the order shown below.
3-1. DISASSEMBLY FLOW
SET
3-2.SIDE PANEL, TOP CASE
(Page 8)
3-3.LOADING PANEL ASSY
(Page 8)
3-4.FRONT PANEL ASSY
(Page 9)
HCD-GNX88
SECTION 3
DISASSEMBLY
3-5.TUNER PACK
(Page 9)
3-8.CD MECHANISM DECK
(Page 11)
3-10.BACK PANEL
(Page 12)
3-6.TAPE MECHANISM DECK,
MIC BOARD
(Page 10)
3-9.CDG BOARD
(Page 11)
3-15.DRIVER BOARD,
SW BOARD
(Page 14)
3-7.PANEL BOARD,
CD-SW BOARD
(Page 10)
3-16.BD84 BOARD
(Page 15)
3-17.SENSOR BOARD
(Page 15)
3-12.POWER AMP PC BOARD ASSY,
MAIN BOARD
(Page 13)
3-13.SURROUND BOARD,
PA BOARD
(Page 13)
3-11.PRIMARY BOARD
(Page 12)
3-14.POWER TRANSFORMER
(T1200)
(Page 14)
3-18.MOTOR (TB) BOARD
(Page 16)
3-19.MOTOR (LD) BOARD
(Page 16)
7
HCD-GNX88
Note: Follow the disassembly procedure in the numerical order given.
3-2. SIDE PANEL, TOP CASE
7
two screws
PANEL (SIDE-R)
0
9
6
screw
(case 3 TP2)
(3X8)
(case 3 TP2)
(3X12)
8
two screws
(+BVTP 3X10)
qd
CASE (TOP)
qs
qa
two screws
(+BVTP 3X10)
2
two screws
(case 3 TP2)
(3X12)
3-3. LOADING PANEL ASSY
CD mechanismdeck (CDM74-F1BD84)
1
Turn the pulley to the arrow direction.
Pulley
Front side
2
Pull out disc tray
loading panel assy
4
3
4
5
1
screw (case 3 TP2)
(3X8)
3
two screws
(+BVTP 3X10)
PANEL (SIDE-L)
8
3-4. FRONT PANEL ASSY
4
screw
(+BVTP 3X10)
6
front panel assy
9
CNP509
8
CNP508
3
screw
(+BVTP 3X10)
qa
(CN1102)
7
connector
(CN100)
lug
connector
HCD-GNX88
3-5. TUNER PACK
2
two screws
(+BVTP 3X10)
q;
connector
qs
connector
(tape mechanism deck)
1
two screws
(+BVTP 3X10)
2
CNP1
(CN503)
3
tuner pack
5
screw
(+BVTP 3X6)
1
two screws
(+BVTP 3X6)
9
HCD-GNX88
)
3-6. TAPE MECHANISM DECK, MIC BOARD
4
screw
(+BVTP2.6 (3CR))
3
cover (TCM)
5
tape mechanism deck
6
two screws
(+BVTP2.6 (3CR))
7
bracket (MIC)
1
two screws
(+BVTP2.6 (3CR)
2
two screws
(+BVTP2.6 (3CR))
8
knob (MIC)
3-7. PANEL BOARD, CD-SW BOARD
qa
CD-SW board
9
claw
1
knob vol
9
MIC board
7
three screws
(+BVTP2.6 (3CR))
6
(+BVTP2.6 (3CR))
8
connector
(CNS902)
two screws
5
(+BVTP2.6 (3CR))
4
(+BVTP2.6 (3CR))
0
two screws
two screws
3
three screws
(+BVTP2.6 (3CR))
PANEL board
10
2
knob (AMS)
3-8. CD MECHANISM DECK
1
CD mechanism deck
4
connector
(CN701)
5
connector
(CN560)
2
CNP505
3
CNP504
HCD-GNX88
3-9. CDG BOARD
MAIN board
3
CDM cover
2
screw
(+BVTP 3X10)
5
screw
(+BVTP 3X10)
1
two screws
(+BVTP 3X10)
6
CDG board
4
screw (+BVTP 3X10)
11
HCD-GNX88
)
3-10. BACK PANEL
2
(CN1204)
6
connector
(CN580)
5
back panel
connector
1
connector
(CN1200)
4
four screws
(+BVTP 3X10)
3
four screws
(+BVTP 3X10
3-11. PRIMARY BOARD
4
1
(CN101)
PRIMARY board
connector
3
screw
(+BVTP 3X8)
2
connector
(CN201)
12
3-12. POWER AMP PC BOARD ASSY, MAIN BOARD
)
)
4
two screws
(+BVTP 3X6)
3
screw
(+BVTP 3X6)
1
connector
(CN1213)
2
connector
(CN1212)
5
screw
(+BVTP 3X6)
7
power amp pc board assy
6
screw
(+BVTP 3X10)
8
connector
(CN105)
HCD-GNX88
3-13. SURROUND BOARD, PA BOARD
0
heat sink
5
two screws
(+BVTP 3X10)
qa
MAIN board
3
SURROUND board
q;
screw
(+BVTP 3X10
9
two screws
(+BVTP 3X10)
1
two screws
(+BVTP 3X10
qs
bracket
2
two screws
(transistor)
6
qd
PA board
4
connector
(CN607)
holder
7
(+BVTP 3X10)
9
two screws
(+BVTP 3X10)
qa
screw
(+BVTP 3X10)
8
(transistor)
three screws
two screws
13
HCD-GNX88
)
3-14. POWER TRANSFORMER (T1200)
1
connector
(CN1213)
2
connector
(CN1212)
TRANS board
3
two screws
5
power transfomer (T1200
4
two screws
3-15. DRIVER BOARD, SW BOARD
1
two
screws
(+BTTP (M2.6))
4
DRIVER
2
wire (flat type) (CN702)
board
3
connector (CN703)
5
screw
(+BTTP (M2.6))
6
SW board
14
3-16. BD84 BOARD
2
h
older (213) ASSY
qh
optical pick-up
(KSM-215DCP/C2NP)
0
two
insulators
9
two
coil springs
(insulator)
8
t
wo stoppers (BU)
qa
1
floating
(+PTPWH M2.6)
6
two
insulators
5
two
coil springs
(insulator)
3
screw
(BVTT M2.6)
4
floating
(+PTPWH M2.6)
screw
HCD-GNX88
screw
3-17. SENSOR BOARD
2
t
ray
7
(BVTT M2.6)
qd
Remove the four solderings of motor.
1
floating
(+PTPWH M2.6)
6
floating
(+PTPWH M2.6)
screw
8
s
(+BTTP (M2.6))
screw
t
wo screws
crew
0
SENSOR board
9
connector
(
CN731)
qf
CN101 (flat type)
qg
C
D board
qs
s
crew (+BVTP 2.6x 8)
3
b
elt (table)
4
floating
(+PTPWH M2.6)
5
screw
p
ulley (table)
7
g
ear (geneva)
15
HCD-GNX88
3-18. MOTOR (TB) BOARD
2
stopper
4
1
stopper
7
t
able motor assy (M741)
3-19. MOTOR (LD) BOARD
4
Remove the two solderings of motor.
5
l
oading motor assy (M751)
3
8
MOTOR (TB) board
6
Remove the two solderings of motor.
5
two
screws
(+BTTP (M2.6))
2
two
screws
(+BTTP (M2.6))
3
wire (flat type) 5 core (CN742)
MOTOR (LD) board
16
1
b
elt (loading)
SECTION 4
TEST MODE
HCD-GNX88
[GC TEST MODE]
• This mode is used to check the fluorescent indicator tube,
LEDs, keys, VOLUME jog, OPERATION DIAL jog, AMS
jog, destination, software version and VACS level.
Procedure:
1. Press x button, [ENTER] button and [DISC 2] button
simultaneously.
2. All LEDs and segments in fluorescent indicator tube are lighted
up. All LEDs are lighted up in red color. If the system is turned
on, the I/O LED is lighted up in green color.
3. When you want to enter the software version display mode,
press [DISC 1] button. The model and destination are displayed.
4. Each time [DISC 1] button is pressed, the display changes from
MC version, GC version, CD version, CDDM version, CDMA
version, CDMB version, BDA version, BDB version, ST
version, TA version, TM version and TC version in this order,
and returns to the MC version display.
5. When [DISC 3] button is pressed while the version numbers
are being displayed except model and destination, the date of
the software creation appear. When [DISC 3] button is pressed
again, the display returns to the software version display. When
[DISC 1] button is pressed while the date of the software
creation is being displayed, the date of the software creation
is displayed in the same order of software version display.
6. Press [DISC 2] button, the key check mode is activated.
7. In the key check mode, the fluorescent indicator tube displays
“K 0 J0V0 X0”.
Each time a button is pressed, “K” value increases. However,
once a button has been pressed, it is no longer taken into
account.
“J” value increases in the manner of 0,1, 2, 3 ... if [OPERATION
DIAL] knob is turned clockwise, or it decreases in the manner
of 0, 9, 8, 7 ... if [OPERATION DIAL] knob is turned counterclockwise.
“V” value increases in the manner of 0,1, 2, 3 ... if [VOLUME]
knob is turned clockwise, or it decreases in the manner of 0,
9, 8, 7 ... if [VOLUME] knob is turned counter-clockwise.
“E” value increases in the manner of 0,1, 2, 3 ... if
knob is turned clockwise, or it decreases in the manner of 0,
9, 8, 7 ... if
8. When [DISC 3] button is pressed after all LEDs and segments
in fluorescent indicator tube light up, the fluorescent indicator
tube displays “VACS A+B APCC”. A is VACS level which is
trigger by signal level, B is VACS level which is trigger by
temperature and CC is VACS level which is trigger by
APVACS (Abuse Protection VACS).
The signal level, which will trigger VACS A is shown in the
center area.
9. When [EX-CHANGE/DISC SKIP] button is pressed after all
LEDs and segments in fluorescent indicator tube light up,
alternate segments in fluorescent indicator tube would light
up. If you press [EX-CHANGE/DISC SKIP] button again, another
half of alternate segments in fluorescent indicator tube would
light up. Pressing [EX-CHANGE/DISC SKIP] button again
would case all segments lights up.
10. To release this mode, press three buttons in the same manner
as step 1, or disconnect the power cord.
.
knob is turned counter-clockwise.
>
.
>
[MC TEST MODE]
• This mode is used to check operations of the respective sections
of Amplifier, Tuner, and Tape.
Procedure:
* To enter MC Test Mode
1. Press x button, [ENTER] button and [DISC 3] button
simultaneously.
2. The CD ring indicators TAPE A and TAPE B indicators flash
on the fluorescent indicator tube. The function is changed to
VIDEO.
* Check of Amplifier
1. Press [EQ BAND] button repeatedly until a message “GEQ
MAX” appears on the fluorescent indicator tube. GEQ
increases to its maximum.
2. Press [EQ BAND] button repeatedly until a message “GEQ
MIN” appears on the fluorescent indicator tube. GEQ increases
to its minimum.
3. Press [EQ BAND] button repeatedly until a message “GEQ
FLAT” appears on the fluorescent indicator tube. GEQ set to
flat.
4. When the [VOLUME] knob is turned clockwise even slightly,
the sound volume increases to its maximum and a message
“VOLUME MAX” appears.
5. When the [VOLUME] knob is turned counter-clockwise even
slightly, the sound volume decreases to its minimum and a
message “VOLUME MIN” appears.
* Tape function
1. When a tape is inserted in Deck B and recording is started, the
function is changed to VIDEO automatically. When [CD SYNC]
button is pressed during recording in function, ALC (Automatic
Level Control) is turned on.
2. During recording, turn
rotation will change the function to TAPE B and rewind Tape
B until the recording start position and playback of Tape B is
started. If the [REC PAUSE/ START] button is pressed for a
pause and pressed again to resume recording during recording
time, when tape deck B is rewind, tape deck B will be rewind
until the position where the pause is applied.
* To release MC Test mode.
1. To release this mode, press
2. The cold reset is enforced at the same time.
[COLD RESET]
• The cold reset clears all data including preset data stored in
the RAM to initial conditions. Execute this mode when
returning the set to the customer.
Procedure:
1. Press x button, [ENTER] button, and
simultaneously.
2. The fluorescent indicator tube becomes blank for a while, and
the set is reset.
m
knob to counter clockwise
M
button.
?/1
?/1
button
17
HCD-GNX88
[VACS ON/OFF]
• This mode is used to switch ON and OFF the VACS (Variable
Attenuation Control System).
Procedure:
1. Press
2. Press x button and [ILLUMINATION]
The message “VACS OFF” or “VACS ON” appears.
[TUNER STEP CHANGE]
• The step interval of AM channels can be toggled between 9
kHz and 10 kHz.
Procedure:
1. Press
2. Press [TUNER/BAND] button to select the “AM”.
3. Press
4. Press [ENTER] button and
system will turn ON automatically. The message “AM 9k
STEP” or AM 10k STEP” appears and thus the channel step
is changed.
[CD SERVICE MODE]
• This mode let you move the CD sled motor freely. Use this
mode when you want to clean the optical pick-up.
button to turn the set ON.
?/1
button to turn the set ON.
?/1
button to turn the set OFF.
?/1
button simultaneously.
button simultaneously. The
?/1
[AGING MODE]
This mode can be used for operation check of CD section.
• If an error occurs, the aging operation would stops and the
status is displayed.
• If there are no error occurs, the aging operation would
continues repeatedly.
Procedure:
1. Press
2. Select CD function.
3. Load three discs on the disc tray.
4. Press [PLAY MODE] button to select the “ALL DISCS” mode,
and press the [REPEAT] button to select “REPEAT OFF” mode.
5. Press x button, [ENTER] button, and [EX-CHANGE/DISC
SKIP] button simultaneously.
6. Aging operation is started.
7. To release this mode, press
power cord to turn the power OFF.
Aging mode sequence:
button to turn the set ON
?/1
Start (from disc 1)
Disc chucking
button or disconnect the
?/1
Procedure:
1. Press
2. Select CD function.
3. Press x , [ENTER] button, and
simultaneously.
4. The CD service mode is activated. The message “SERVICE
MODE” appears.
5. With the CD in stop status, turn
rotation to move the optical pick-up to outside track, or turn
m
inside track. The message “SLED OUT” or “SLED IN”
appears.
6. To turn on or off the laser, press [DIRECTION] button. The
message “LASER ON” or “LASER OFF” appears on the
fluorescent indicator tube.
7. To release this mode, press
button to turn the set ON.
?/1
knob to counterclockwise rotation to move to
M
?/1
Z
m
button.
OPEN/CLOSE
knob to clockwise
M
button
TOC reading
Play first track for 2 seconds
Play last track for 2 seconds
EX-CHANGE open/close
Open the disc tray
Disc skip
Close the disk tray
Change the next disc
18
HCD-GNX88
• Display when an error occurred (CD Error Code Mode)
Procedure:
1. Press x button, [ENTER] button and [DISC 1] button
simultaneously to enter the error code display mode.
2. The fluorescent indicator tube displays the number of total
error.
3. Each time
m
knob is rotated, display change as
M
below.
Display of total error
>
>
+
direction
Display of Mechanical errors
+
direction
Display of no disc errors
–
.
–
.
direction
direction
4. To clear the error record, operate the cold reset. (Refer to the
“MC COLD RESET”)
5. To release this mode, press the
button or disconnect
?/1
the power plug to turn the power OFF.
1) Display of total error
Display
EM**ED**
3) Display of no disc errors
Display
D*$$%%&&##00
D*: The number of mechanical error (“00” is latest one)
(Rotate
.
error)
$$: Error type
01: Focus error
02: GFS error
03: Setup error
%%: Not used
&&:
00: No disc judgment without chucking retry.
01: No disc judgment after chucking retry.
##: The state when judged as no disc
01: Stop
02: Setup
03: TOC reading
04: Access
05: Playback
06: Pause
07: Manual search (Play)
08: Manual search (Pause)
[CD REPEAT 5 LIMIT OFF MODE]
• The number of repeat for CD playback is 5 times when the
repeat mode is “REPEAT ALL”. This mode enables CD to
repeat playback for limitless times.
knob in the direction of either to display next
>
EM**: The number of mechanical errors.
ED**: The number of no disc errors after chucking the disc.
2) Display of mechanical errors
Display
M*$$%%&&##00
M*: The number of mechanical error (“00” is latest one)
(Rotate
.
error)
$$: Not used
%%: Loading related error (Second figure is not used)
D: Stop by the problem other than mechanical problem while
closing.
E: Stop by the problem other than mechanical problem while
opening.
C: Stop by the problem other than mechanical problem while
chucking up.
F: Stop by the problem other than mechanical problem while
chucking down.
&&: Emerging error
01: Stop while chucking up.
02: Stop while chucking up.
03: Time-out of EX-CHANGE open.
05: Time-out of EX-CHANGE close.
##: Not used
knob in the direction of either to display next
>
Procedure:
1. Press
button to turn the set ON.
?/1
2. Select CD function.
3. Press x button, [CD] button and [DISC 1] button
simultaneously to enter the CD repeat 5 limit off mode and
the fluorescent indicator tube displays “LIMIT OFF”.
4. To release this mode, operate the cold reset. (Refer to the “MC
COLD RESET”)
[CD SHIP MODE (WITH MEMORY CLEAR)]
• This mode moves the optical pick-up to the position durable
to vibration and clears all data including preset data stored in
the RAM to initial conditions. Use this mode when returning
the set to the customer after repair.
Procedure:
1. Press
button to turn the set ON.
?/1
2. Select CD function.
3. Press x
button,
[CD]
button and
button simultaneously.
?/1
The set will power off automatically.
4. After the “STANDBY” blinking display finish, a message
“LOCK” is displayed on the fluorescent indicator tube and
the CD ship mode is set.
19
HCD-GNX88
[CD SHIP MODE (WITHOUT MEMORY CLEAR)]
• This mode moves the optical pick-up to the position durable
to vibration. Use this mode when returning the set to the
customer after repair.
Procedure:
1. Press
2. Select CD function.
3. Press [CD] button and
will power off automatically.
4. After the “STANDBY” blinking display finish, a message
“LOCK” is displayed on the fluorescent indicator tube and
the CD ship mode is set.
[CD POWER MANAGE]
• This mode let you switch on or off power supply to the BU
during TUNER function.
• When CD POWER is set to OFF, the power supply to the BU
is cut off during TUNER function. It will increase the time
taken to access CD when function change from TUNER to
CD but it will improve tuner reception.
• When CD POWER is set to ON, the power supply to the BU
is not cut off during TUNER function. It will reduce the time
taken to access CD when function change from TUNER to
CD but it will decrease tuner reception performance.
Procedure:
1. Press
2. Select CD function.
3. Press
4. Press x button and
will power on automatically.
5. The message “CD POWER ON” or “CD POWER OFF” will
be displayed on the fluorescent indicator tube.
button to turn the set ON.
?/1
?/1
button to turn the set ON.
?/1
button to turn the set OFF.
?/1
?/1
button simultaneously. The set
button simultaneously. The set
[CD TRAY LOCK MODE]
• This mode let you lock the disc trays. When this mode is
activated, the disc tray will not open when
button or [EX-CHANGE/DISC SKIP] button is pressed. The
message “LOCKED” will be displayed in the will be displayed
on the fluorescent indicator tube.
Procedure:
1. Press
2. Select CD function.
3. Press x button and
simultaneously and hold down until “LOCKED” or
“UNLOCKED” displayed on the fluorescent indicator tube
(around 5 seconds).
[VIDEO/MD SWITCHING]
• This mode let you switch from VIDEO to MD and vice-versa.
Procedure:
1. Press
2. Select VIDEO function.
3. Press [VIDEO/MD] button and
The function will change to MD. Press the same buttons again
to change from MD to VIDEO.
[REMOTE COMMANDER DISABLE MODE]
• This mode let you disable the remote commander reception.
When this mode is activated, the set will not response if the
button on the remote commander is pressed. The message
“RemoteDisable” will be displayed on the fluorescent indicator
tube. Use this mode during aging to avoid disturbance.
• Procedure:
1. Press x button, [GROOVE] button and [DISC 2] button
simultaneously.
“RemoteDisable” displayed on the fluorescent indicator
tube. To enable the remote commander reception, press the
same buttons again.
“RemoteEnable” displayed on the fluorescent indicator
tube.
button to turn the set ON.
?/1
Z
button to turn the set ON.
?/1
OPEN/CLOSE
?/1
OPEN/CLOSE
Z
button
button simultaneously.
20
HCD-GNX88
SECTION 5
MECHANICAL ADJUSTMENTS
Precaution
1. Clean the following parts with a denatured alcohol-moistened
swab:
record/playback heads pinch rollers
erase head rubber belts
capstan idlers
2. Demagnetize the record/playback head with a head
demagnetizer.
3. Do not use a magnetized screwdriver for the adjustments.
4. After the adjustments, apply suitable locking compound to
the parts adjusted.
5. The adjustments should be performed with the rated power
supply voltage unless otherwise noted.
Torque Measurement
Mode Torque meter Meter reading
3.06 N • m to 6.96 N • m
FWD CQ-102C 31 to 71 g • cm
(0.43 – 0.98 oz • inch)
FWD
back tension
REV CQ-102RC 31 to 71 g • cm
REV
back tension
FF/REW CQ-201B 71 to 143 g • cm
FWD tension CQ-403A 100 g or more
REV tension CQ-403R 100 g or more
CQ-102C 2 to 6 g • cm
CQ-102RC 2 to 6 g • cm
0.19 N • m to 0.58 N • m
(0.02 – 0.08 oz • inch)
3.06 N • m to 6.96 N • m
(0.43 – 0.98 oz • inch)
0.19 N • m to 0.58 N • m
(0.02 – 0.08 oz • inch)
6.96 N • m to 14.02 N • m
(0.98 – 1.99 oz • inch)
9.80 N • m
(3.53 oz or more)
9.80 N • m
(3.53 oz or more)
SECTION 6
ELECTRICAL ADJUSTMENTS
DECK SECTION
1. Demagnetize the record/playback head with a head
demagnetizer.
2. Do not use a magnetized screwdriver for the adjustments.
3. After the adjustments, apply suitable locking compound to the
parts adjust.
4. The adjustments should be performed with the rated power
supply voltage unless otherwise noted.
5. The adjustments should be performed in the order given in
this service manual. (As a general rule, playback circuit
adjustment should be completed before performing recording
circuit adjustment.)
6. The adjustments should be performed for both L-CH and RCH.
7. Switches and controls should be set as follows unless otherwise
specified.
•Test Tape
Tape Signal Used for
P-4-A100 10 kHz, –10 dB Azimuth Adjustment
RECORD/PLAYBACK HEAD AZIMUTH ADJUST-MENT
DECK A DECK B
Note: Perform this adjustments for both decks
Procedure:
1. Mode: Playback
test tape
P-4-A100
(10 kHz, –10 dB)
0 dB=0.775 V
MAIN board
CN510
Pin
1
3
Pin
set
MAIN board
CN510
2
Pin
(L-CH)
(R-CH)
(GND)
level meter
+
–
21
HCD-GNX88
e
2. Turn the adjustment screw and check output peaks. If the peaks
do not match for L-CH and R-CH, turn the adjustment screw
so that outputs match within 1dB of peak.
Output
level
within
1dB
L-CH
peak
R-CH
peak
within
1dB
Screw
position
L-CH
peak
Screw
position
R-CH
peak
3. Mode: Playback
test tape
P-4-A100
(10 kHz, –10 dB)
L-CH
MAIN
board
CN510
set
R-CH
waveform of oscilloscope
pin
L
R
pin
pin
3
1
2
oscilloscop
V
H
CD SECTION
Note:
1. CD Block is basically designed to operate without adjustment.
Therefore, check each item in order given.
2. Use YEDS-18 disc (3-702-101-01) unless otherwise indicated.
3. Use an oscilloscope with more than 10MΩ impedance.
4. Clean the object lens by an applicator with neutral detergent
when the signal level is low than specified value with the
following checks.
S-curve Check
Connection:
oscilloscope
BD84 board
TPO102 (FE1)
TP117 (VC)
Procedure:
1. Connect an oscilloscope to test point TPO102 (FE1) and TP
117(VC) on the BD84 board.
2. Turn the power on.
3. Put the disc (YEDS-18) in and turned power switch on again
and actuate the focus search. (actuate the focus search when
disc table is moving in and out)
4. Check the oscilloscope waveform (S-curve) is symmetrical
between A and B. And confirm peak to peak level within
2.4 ± 1 Vp-p.
+
–
in phase 45°90°135°180
good
°
wrong
4. After the adjustments, apply suitable locking compound to
the pats adjusted.
Adjustment Location: Playback Head (Deck A).
Record/Playback/Erase Head (Deck B).
S-curve waveform
symmetry
A
within 2.4
B
Note:
•Try to measure several times to make sure than the ratio
of A : B or B : A is more than 10 : 7.
•Take sweep time as long as possible and light up the
brightness to obtain best waveform.
Checking Location: BD84 board (SIDE B)
(See page 24.)
±
1 Vp-p
22
forward
reverse
HCD-GNX88
RFAC Level Check
Connection:
oscilloscope
BD84 board
TP124 (RFAC)
TP117 (VC)
+
–
Procedure:
1. Connect an oscilloscope to test point TP124 (RFAC) and TP
117(VC) on the BD84 board.
2. Turn the power on.
3. Put the disc (YEDS-18) in to playback the number five track.
4. Confirm that oscilloscope waveform is clear and check RFAC
signal level is correct or not.
Note: A clear RFAC signal waveform means that the shape “◊” can be
RFAC signal waveform
clearly distinguished at the center of the waveform.
VOLT/DIV: 200 mV
TIME/DIV: 500 ns
level: 0.9 ± 0.4 Vp-p
E-F Balance Check
Connection:
oscilloscope
BD84 board
TPO103 (TE1)
TP117 (VC)
+
–
Procedure:
1. Connect an oscilloscpe to test point TPO103 (TE1) and TP117
(VC) on the BD84 board.
2. Turn the power on.
3. Select the function “CD”.
4. Press three buttons of [ENTER], M , and
[SURRUUND MODE] simultaneously to set the CD service
mode.
5. Put the disc (YEDS-18) in to playback the number five track.
6. Press the . button. The message “TRAVERSE” is
displayed. (The tracking servo and the sledding servo are
turned OFF)
7. Check the level B of the oscilliscope's waveform and the A
(DC voltage) of the center of the Traverse waveform.
Confirm the following :
A/B x 100 = less than ± 22%
Tr averse Waveform
Center of
the waveform
Checking Location: BD84 board (SIDE B)
(See page 24.)
B
0V
level: 1.0 ± 0.5 Vp-p
8. Press the . button. The message “TRAVERSE” is
A (DC
voltage)
displayed. (The tracking servo and sledding servo are turned
ON)
Confirm the C (DC voltage) is almost equal to the A (DC
voltage) is step 5.
9. To exit from this mode, perform as follows.
1) Move the optical pick-up to the most inside track.
2) Press three buttons of x , [CLEAR], and [DISPLAY]
simultaneously. (cold reset)
Notes:
• Always move the optical pick-up to most inside track
when exiting from this mode. Otherwise, a disc will not
be unloaded.
• Do not run the sled motor excessively, otherwise the gear
can be chipped.
Tr averse Waveform
0V
Tr acking servo
Sled servo
OFF
Tr acking servo
Sled servo
ON
Checking Location: BD84 board (SIDE B) (See page 24.)
C (DC
voltage)
23
HCD-GNX88
Checking Location:
– BD84 BOARD (SIDE B) –
TP117 (VC)
JPO103 (TE1)
JPO102 (FE1)
IC101
TP124 (RFAC)
24
SECTION 7
DIAGRAMS
HCD-GNX88
For schematic diagrams.
Note:
• All capacitors are in µF unless otherwise noted. (p: pF)
50 V or less are not indicated except for electrolytics and
tantalums.
• All resistors are in Ω and 1/
specified.
•%: indicates tolerance.
• f : internal component.
• 2 : nonflammable resistor.
• 5 : fusible resistor.
Note: The components identified by mark 0 or dotted line
with mark ! are critical for safety.
Replace only with part number specified.
• C : panel designation.
• A : B+ Line.
• B : B– Line.
• H : adjustment for repair.
•Voltages and waveforms are dc with respect to ground
under no-signal conditions.
BD84 board
no mark: CD PLAY
Other board
no mark: TUNER (FM/AM)
( ) : CD PLAY
< > : TAPE PLAY
[ ] : TAPE REC
* : Impossible to measure
•Voltages are taken with a VOM (Input impedance 10 MΩ).
Voltage variations may be noted due to normal production tolerances.
•Waveforms are taken with a oscilloscope.
Voltage variations may be noted due to normal production tolerances.
• Signal path.
F : TUNER (FM/AM)
E : TAPE PLAY (DECK A)
d : TAPE PLAY (DECK B)
G : RECORD
J : CD PLAY
N : MIC INPUT
c : CDG
g : VIDEO
4
W or less unless otherwise
Note on Printed Wiring Boards:
Note:
• X : parts extracted from the component side.
• : Pattern from the side which enables seeing.
(The other layers' patterns are not indicated.)
Caution:
Parts face side: Parts on the parts face side seen from
(Side A) the parts face are indicated.
Pattern face side: Parts on the pattern face side seen from
(Side B) the pattern face are indicated.
• Indication of transistor.
C
B
B
Q
B
E
Q
CE
Q
CE
These are omitted.
These are omitted.
These are omitted.
25
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